Flowserve Limitorque MX DeviceNet Field Unit - Manual (Page 34)

Limitorque MX DeviceNet Field Unit FCD LMENIM2328-00 – 11/05
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Table 4.41 – Analog Output Point Object
Instance ID Channel Interface Object Source
1 Instance Attribute 19 AO_Analog_Output_CHAN
4.4.8 MAC ID
The MX-DeviceNet unit may have the MAC ID set by one of two different methods. The first is the MX
LCD display. The other is via the DeviceNet bus.
4.4.9 Baud Rate
The MX-DeviceNet unit may have the Baud Rate set by one of two different methods. The first is the MX
LCS display. The other is via the DeviceNet bus.
4.5 Network Management
4.5.1 Offline Connection Set
NOTE: The DeviceNet Limitorque Interface supports Offline Connection Set. The Offline Connection Set
is used to bring back a node to the DeviceNet bus which is in the Communication Fault State. This state
will be entered in the case of a duplicate MAC ID error is detected.
4.5.2 Device Heartbeat Message
The DeviceNet Limitorque Interface supports Device Heartbeat message. This message broadcasts the
current state of the DeviceNet Limitorque Interface. Table 4.42 shows the format of the data field of the
Device Heartbeat Message.
Table 4.42 – Format of the Device Heartbeat Message
Byte Set 7 6 5 4 3 2 1 0
0 DeviceNet Protocol Specific
1
2
Identity Object Instance ID = 1
3
4
Device Stats = 3
5 Reserved
(0) EV
(0) SF UF
(0) DF
6 (0) because the Configuration Consistency Value (Attribute 8 of the Identity Object Instance) is not
supported by the DeviceNet Limitorque
7
EV Event Flag, zero (0)
SF System Fault, a fault in the device caused by DeviceNet bus interaction (e.g. connection timeout).
This flag is set, when a system fault is present. This DeviceNet Limitorque Interface flag is set when a
connection times out.
UF User Fault, a fault in the device caused by user interaction. This flag is set when a user fault is
present. The conditions under which is set are vendor specific. This DeviceNet Limitorque Interface flag
is not used and is zero (0).
DF Device Fault, an internal fault in the device not caused by user or bus interaction (e.g. hardware
fault). This flag is set when a device fault is present. This DeviceNet Limitorque Interface flag is set
under the following conditions:
(DI_Actuator_Faults_1_Chan ≠ 0) OR (DI_Actuator_Faults_3_Chan ≠ 0) •